If Tehran is leaning more towards buying the Su-35, we need to analyze why the other two fighters - Chinese J-10 and JF-17 are still on the negotiating table.| Bulgarian Military Industry Review
The first variant was developed in the Soviet Union as early as the 1980s. The version, initially referred to as the Su-27M, had a revised airframe, duck wings, an enlarged radome for the N-011 radar and improved avionics.| Bulgarian Military Industry Review